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It's important to remember that the drawings we create in AutoCAD are construction drawings. This means that someone somewhere will be referring to our drawing in order to construct our design. Knowing this, we need to be sure that our design is well-dimensioned such that it can be accurately reproduced in the real world. Let's look at how we can add dimensions to our drawings. Now we are going to open a file. I'm going to come up and click my Open icon and we are going to look inside the Chapter 12 folder located inside the Exercise Files directory and I would like to open up drawing number 1, the Birdhouse drawing.
So I'm going to highlight that guy and click Open. Now this is a simple drawing of a birdhouse and we are going to use this guy to play around with several of the dimensioning features. Now if I want to create dimensions, I'm going to turn on the Dimension toolbar. I can do that by moving my cursor over an existing tool and right-clicking and in the list of toolbars I'm going to come up and select Dimension. And when I do the Dimension toolbar pops up right in the middle of my screen. Now this guy is going to be important to us so I'm going to dock him to my interface.
Let me move my cursor up to the blue area and I will click and hold and I will push this guy up at the top of the interface and I will release to dock him. Now I would like to dimension my Birdhouse from front to back. I'm going to do this by using a linear dimension. Let me come up and click my Linear icon. And AutoCAD is asking me to specify my first extension line origin. Generally speaking when I want to create a dimension in AutoCAD, I will click one point and then another and AutoCAD will create the dimension line between them.
It is important when we create dimensions that we use Object Snaps. Object Snaps are the only way to guarantee that our dimensions are accurate. Now I happen to have a running Object Snap set for endpoint so let me move close to my Birdhouse and I will click. I want to dimension from this point and I will come over and click this point. And as I move away with my cursor I can click one more time to set the location of the dimension. Now let me zoom in on this guy. Notice this dimension is to 4 decimal spaces and it's ugly.
Dimensions are kind of like text. The default settings aren't the most attractive and in a future session we will learn how to make our dimensions look better. For right now once again we are concerned about function more than form. Let me backup. I would like to place another linear dimension. Let me move up and click my Linear icon and I am going to dimension the roof of my birdhouse. Let me click the very top from my start point and then I will come down and click this endpoint and notice as I pull up AutoCAD is giving me the horizontal distance between those points.
If I move my cursor to the left AutoCAD will give me the vertical distance between those points. So a linear dimension by definition will give us the true horizontal or vertical distance between the points that we click on. I'm just going to go ahead and pull this guy up and I will click to place my dimension. Now this is in contrast to the next dimension style we are going to look at that is the aligned dimension. Let me click on this icon. This represents an Aligned dimension. I'm going to click my points.
Let me click the endpoint here and I'm going to come down and click the endpoint of the roof. Notice the dimension I'm creating now. An aligned dimension will give us the true distance between the points that we click on. Essentially I'm dragging a dimension line that is parallel to the two points that I clicked. Once again I'm going to click one more time to place my dimension. Let's create a continuous dimension string. This is something that we typically see on our mechanical and architectural drawings.
Now to create a dimension string I need to have a dimension to start from. I would like to create a continuous dimension string that represents the elevations of my birdhouse. Now since I'm dimensioning the vertical distances, I'm going to be using a linear dimension. Let me come up and click Linear then I will move over and I will click my first endpoint. I will come down and click my next endpoint and then I will move my cursor to this side and I will click one more time to place the dimension. I now have my initial dimension that I can create my continuous string from.
Let me move up and click this icon. This guy represents my continuous string and as soon as I click the icon, notice AutoCAD is giving me the rubber-band effect from my previous dimension. At this point all I have to do is click the endpoints where I would like to create my dimensions. I will click here. I click the top of the base and I will click the bottom. When I'm finished I will right-click to finish my string and select Enter. Notice AutoCAD is still in the command. It's saying Select continued dimension.
I could create another string if I wish. Watch if I come over and click this dimension. I can pull a continuous string from this guy. Let's dimension to this end of the birdhouse. When I'm done I can right-click and select Enter and then I will hit Escape to get out of the command. Let's create some baseline dimensions. Now baseline is similar to continuous in that I have to have a dimension to start from. So I'm going to create some baseline dimensions on the front of my birdhouse representing elevation so I'm going to use a linear dimension.
We click Linear. I want the vertical distance between the endpoint here and the endpoint here and I will pull this guy away. Now that I have a dimension to start from let's create our baseline dimensions. I'm going to come up and click my Baseline icon. When I do AutoCAD is giving me the rubber-band effect from the previous dimension. I'm just going to come down and click each point that I would like to dimension to. I want to dimension to the endpoint here. I want to dimension to the top of the base and I want to dimension to the bottom.
When I'm finished I can right-click and select Enter. Notice the baseline acts just like continuous so I could create baselines from another dimension. I'm just going to hit my Escape key to jump out of the command. Notice my baselines are all measuring from the original location. Unfortunately they kind of overlap a little bit and they are on the ugly side but once again we will learn how to correct that in a future session. Let's create an angular dimension. I'm going to zoom in on the front of my birdhouse and if I want to create an angular dimension I'm going to come up and click my Angular icon.
Now to create an angular dimension all we have to do is click one line and then another and AutoCAD will dimension between them. So I will click this line and then this one and then I will move my cursor away and click to set the location of the dimension. Let's make one more. I'm going to come up and click the Angular icon again and we will dimension the angle down here. Let me click this line and this one. As I pull away AutoCAD is creating the dimension. Watch this. If I move my cursor outside the lines AutoCAD will dimension the supplementary angle.
If I move below AutoCAD is dimensioning the opposite angle and if I move over to the right I'm getting the opposite supplementary angle. So the location of our cursor will dictate which angle is being dimensioned. I'm going to click right here to place my dimension. Let's create a radial dimension. If I want to create a radial dimension I'm going to come up and click my Radius button. AutoCAD is asking me to select an arc or a circle. I'm just going to click this circle right here. AutoCAD gives me the radius.
By default it is set to a leader. I'm just going to pull away and I will click to set the location of my dimension. Let's try a diameter. If I would like to dimension a diameter I'm going to come up and click my Diameter icon. If AutoCAD is asking me to select arc or circle, let me grab this circle and once again I'm creating a leader. Let me pull away and I'm going to click to place the leader in my drawing. Now be careful. I have a running Object Snap. If I was to try and drop this leader right here my number would snap right to the end of that line so be cautious with the running Object Snaps when you are placing your dimensions.
I'm going to click right here to place my dimension. Notice the diameter dimension contains the Diameter symbol. This is how we can tell the difference. Based on the dimensioning skills we have just learned we now know enough dimensioning types to fully dimension this part. Using AutoCAD's dimensioning tools along with our object snaps we can quickly and easily document our design and allow our contractor to accurately reproduce our design out in the field.
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